@Misc{ 
  demfaeper01,
  author = { De Maio, Umberto and Faella, Luisa and Perugia, Carmen },
  title = { Homothetic changes of variables and the unique extension problem of Calculus of Variations },
  journal = { Italian Journal of Pure and Applied Mathematics },
  year = { 2001 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/496/ },
  note = { cvgmt preprint}
}